Question

Is the molar volume of co2 same or different from co?

Answer 1

it is good question different molecules have different molar volume

Answer 2

It can be calculated by dividing Molar mass (M) by mass density (ρ). One mole of any gas at a particular temperature and pressure has fixed volume and known as its Molar gas volume. 
so , u can say molar volume is directly proportional to molar mass...hence con have high molar mass as compared to co